AWalker@RED.RUTGERS.EDU (*Hobbit*) (10/22/85)
Line ------------------------------------------------> to devices
100 ohms
+--/\/\/\/\/\/--+
| |
Line ------+------|<|------+-------------------------> to devices
| |
+------|>|------+
LED
The thing in the middle is a regular diode pointing the other way. If you
want to get fancy, you can use a green LED pointing one way and a red one
pointing the other [in place of the regular one], which will indicate line
polarity. The 100 ohm resistor passes some of the line current and protects
the LEDs. This will give you an almost indiscernible current drop at the
phone end...
_H*
-------WGREGGS@CLEMSON.BITNET (10/24/85)
The device described by the Hobbit will work fine but it will only
display the status of the instruments connected after the device.
Therefore, if one wanted to show the staus of all the instruments
connected to a particular line it would have to be wired in before
the distribution box. Unfortunately it can not be wired in at any
point and provide the status for all branches of the phone line.
W. Gregg Stefancik
Clemson University
(803)-656-7896
BITNET: wgreggs@clemson.BITNET
ARPA : wgreggs%clemson.BITNET@wiscvm.ARPA